Rail bearing for a warp stop motion

ABSTRACT

A rail bearing for a warp knock-off action in a power loom is provided with a substantially U-shaped base body in which is inserted an upright guide plate provided with spaced parallel slots for guide rails, while an upright distance plate mounted on top of the guide plate has parallel slots for contact rails or toothed rails, respectively. A cover is used for clamping the distance plate and the guide plate to the base body.

United States Patent [191 De Faveri Feb. 26, 1974 RAIL BEARING FOR A WARP STOP MOTION [75] Inventor: Gianfrance De Faveri, Zurich,

Switzerland [73] Assignee: Grob & Co. Aktiengesellschafi,

Horgen Switzerland [22] Filed: June 16, 1972 [21] Appl. No.: 263,411

[30] Foreign Application Priority Data June 18, 1971 Switzerland 8974/71 [52] U.S CI. 139/369 [51] int. Cl 003d 51/28 [58] Field of Search 139/349, 353, 358, 369; 66/163 [56] References Cited I UNITED STATES PATENTS Raymond 139/369 3,584,659 9/1968 Pfarrwaller 139/369 1,760,967 6/1930 Shutt i 139/369 1,873,214 8/1932 Payne .1 139/369 Primary Examiner-Henry S. Jaudon Attorney, Agent, or Firm-Hill, Sherman, Meroni, Gross & Simpson [57] ABSTRACT A rail bearing for a warp knock-off action in a power loom is provided with a substantially U-shaped base body in which is inserted an upright guide plate provided with spaced parallel slots for guide rails, while an upright distance plate mounted on top of the guide plate has parallel slots for contact rails or toothed rails, respectively. A cover is used for clamping the distance plate and the guide plate to the base body.

3 Claims, 4 Drawing Figures PATENTED FEB 2 6 I974 saw 2 OF 3 RAIL BEARING FOR A WARP STOP MOTIGN The invention relates to power looms and particularly is directed to a rail bearing for a warp stop motion with electric contact rails or toothed rails and guide rails for the knock-off drop wires.

Rail bearings of this type are known in various constructions. These rail bearings are provided, as is known, for the purpose of maintaining the contact rails or toothed rails and the additional rails for guiding the knock-off drop wires in predetermined distances from each other and to prevent a bending of the rails or a jumping of the same from their bearings during vibrations.

The contact rails or toothed rails and the guide rails have to be adjustable with reference to the warp path as far as the distance from each other is concerned. Up to the present screws have been used for this purpose. In most cases it was possible only to adjust the bearings at the ends of the rails in vertical direction, while an adjustment of the rails in the center of the warp stop motion could not be reliably assured in looms of greater width. Even if one employed screws in connection with vertically adjustable intermediate bearings it was practically impossible in the weaving art to accomplish an accurate adjustment, and, furthermore, this adjustment required an unduly long period of time.

Up to the present, the contact rails or toothed rails have only been supported by the two end hearings in such a manner that the mentioned rails could not jump from the bearings. The employed hold-down devices were either slipped on or screwed into place and could become lost very easily. Also known are flap covers with hinges but the same broke off after a very short period of time. Furthermore, one employed also sliding locks for securing the rails but such sliding locks were subjected to excessive wear or, when made of wearresistant material the sliding locks caused damage to the contact rails. All of these known hold-down devices could not be used, however, on the intermediate bearings because they required too much space. Furthermore, all these known rail bearings used for the ends of the rails had to be constructed differently from the intermediate bearings and this caused additional unwarranted expense.

It is an object of the invention to overcome these disadvantages of the rail bearings of the prior art.

In accordance with the invention, a rail bearing is created which basically is used as an end bearing and also as an intermediate bearing, and is provided with a cover for holding down the rails or which also may be used with the cover. Furthermore, the vertical adjustment of the guide rails and the adjustment of the distances of the contact rails or toothed rails from the warp can be effected in a very simple manner, and without making any type of adjustment errors.

The rail bearing of the invention is distinguished by a substantially U-shaped base body having spaced, parallel upright legs between which a vertically disposed guide plate with slots for the guide rails is inserted, and upon this guide plate is mounted an upright distance plate with slots for the contact rails or toothed rails, respectively.

Suitably the distance plate and the guide plate are clamped by a cover to the base body, whereby the cover is connected by a clamping member, for instance a wire rope, with the base body. This eliminates the possibility that the cover may be misplaced.

The guide plate is suitably constructed in such a manner that the two series of slots of different depth for the guide rails may be attached selectively in two positions which are rotated from one another. Furthermore, it is possible to employ distance plates of different height and of different colors and mount them on the guide plate. In this manner it is possible to recognize at once the vertically adjusted position of the guide rails and the distance of the contact rails or toothed rails, respectively, from the warp in an easy manner.

The invention will now be described in greater detail with reference to the accompanying drawing which illustrates one embodiment of the invention.

IN THE DRAWINGS FIG. I illustrates a top elevational view of the two end bearings and of an intermediate bearing of an electric warp stop motion.

FIG. 2 is a side elevational view of a rail bearing provided with a cover, whereby in half of this Figure an upright distance plate is used having a greater height than the distance plate illustrated in the other half of the Figure.

FIG. 3 is a side elevational view of a rail bearing without the cover, and

FIG. 4 is a side elevational view of a rail bearing according to FIG. 3, but with a guide plate inserted in a position which is rotated 180 from the position shown in FIG. 3.

Referring to FIG. 1, the electric warp stop motion is shown in top elevational view and is provided with a horizontal profile beam I extending over the entire width of the loom and is secured with both of its ends to loom covers which are not illustrated in this Figure. The profile beam I has attached or rather clamped to it in a manner which will be described later, a few rail bearings 2, namely two end bearings and one interme diate bearing. The intermediate bearing is constructed of the same parts as the end bearings, except that it does not have a cover and also has no closure plate. The rail bearings 2 carry and guide in conventional manner, electric contact rails 3 and guide rails 4 for knock-off drop wires one of which is illustrated at 40 in FIG. 4 of the drawings. To both sides of the rails 3 and 4 are arranged yarn carrying rails 5. The contact rails 3 are attached to one of the end bearings, in conventional manner, to a current carrying block 6 from which an electric pulse is transmitted if the warp yarn should break, so that the entire loom is shut down. Near the same end bearing is also arranged a conventional selecting lever 7 by means of which the contact rails 3 are slidably moved in longitudinal direction, in order to facilitate the finding of the broken warp yarn. The construction of this type of warp stop motion is basically well known.

The invention is concerned now with the construction of the rail bearing 2. In FIG. 2 a rail bearing 2 is illustrated which in FIG. 1 is used as an end bearing. The bearing comprises a base body 8 having a U- shaped form provided with two spaced upright parallel legs 0 and 10 connected at their lower ends by a horizontal web 111. Between the upright legs 9 and 10 is inserted a vertical guide plate 12 made of plastic material and provided with two series of vertical slots 13a and 13b, respectively, in its opposite horizontal edges. The

slots 13a and 13b are of different depth. In the series of slots which happen to be arranged in the upper edge of the guide plate 12, namely in FIG. 2, the series of slot 13 a is employed for holding the guide rails 4. In addition, the guide plate 12 is provided with slots 5 in the upper and lower edges for accommodating the yarncarrying rails 5. The latter are only held in these slots and may be withdrawn in order to be re-inserted after having been rotated 180. Since these rails 5 are subject to wear caused by the warp yarns, their use can be doubled by this arrangement.

The guide plate 12 is also provided with slots 14 and recesses 15 in which a distance plate 16 made of plastic may be inserted with its corresponding projections provided on the same. This distance plate 16 has a series of slots 17 in one edge for receiving the contact rails 3. The contact rails 3 are prevented from jumping out of their slots 17 by a cover 18 made of plastic. The cover 18 is held in place by a wire rope or cable 19 which extends through a hollow space in the cover so that it cannot be removed from the latter. One end of the wire rope 19 is connected by means of a block 20 and a screw 21 to the leg 10. The other end of the wire rope 19 is connected by the interposition of a spring 22 to a handle member 23 which, in turn, is secured by pins 24 in sockets 25 provided in the leg 9.

The FIGS. 2, 3, and 4 illustrate that distance plates 16 may be employed which have different heights. By providing a plurality of sockets 25, it is possible to attach distance plates 16 of different heights by means of the cover 18 and the wire rope 19 to the rail bearing. The base body 8 is also provided with threaded bores 26 for the attachment of a closure plate 27 for holding the guide rails 4 as shown in FIG. 1.

For a vertical adjustment of the guide rails 4, the guide plate 12 may be inserted into the base body 8 selectively in two different positions which are rotated 180 with respect to each other. These two positions are illustrated in FIGS. 3 and 4. In FIG. 4 the guide rails 4 are disposed in the slots 13a which are deeper than the position of the guide rails 4 in the slots 13b of FIG. 4.

In addition, there are provided a few differently high distance plates 16, for instance three, in whose slots 17 the contact rails are likewise arranged in different heights. Suitably, the distance plates 16 of different height have also different colors. Upon the occurrance of a warp stop motion, it can be immediately and visibly determined whether the correct distance plates have been inserted.

While the rail bearings used as end bearings are always provided with covers 18, the intermediate bearings as shown in FIGS. 3 and 4 may also be used without such covers.

Up to now the attachment and adjustment, respectively, of the rail bearings, particularly the intermediate bearings was very difficult in view of the poor accessability. However, the rail bearings of the present invention render the attachment and the slidable adjustment of the rail bearings along the profile beam 1 very easy.

The base body 8 is provided with a fixed clamping jaw 29 and also with a movable clamping jaw 28 as shown in FIG. 3. The movable clamping jaw 28 is clamped in position by a screw 30 which extends parallel to the leg 10 and is provided in its head 31 with a hexagonal socket. Both clamping jaws 29 and 28 engage opposite portions of the profile beam 1. For loosening the screw 30 it is only necessary when the knockoff action is mounted in place, to insert a hexagonal wrench into the hexagonal socket 31 and move the wrench about 10 mm through the warp. Thereupon, the rail bearing may be adjusted. It is no longer necessary as heretofore to travel with the hands through the warp in order to loosen and to secure the rail bearing.

What I claim is:

l. A rail bearing for a warp stop motion action having electric contact rails and guide rails for the stop motion drop wires, comprising a base body having two spaced parallel legs, one of said legs having a plurality of recesses therein, an upright guide plate provided with spaced parallel slots for the guide rails disposed between said spaced parallel legs, an upright distance plate disposed on top of said upright guide plate, said distance plate having spaced parallel slots for accommodating the contact rails, a cover for clamping said distance plate and said guide plate to said base body, means for connecting said cover to said base body, said means comprising a cable one end of which is connected to the other leg of said base body, and a gripping member connected to the other end of said cable and connectible to one of a plurality of the recesses in said one leg of said base body.

2. A rail bearing for a stop motion action having electric contact rails and guide rails for the stop motion drop wires, comprising a base body having two spaced parallel legs, an upright guide plate provided with two series of parallel slots of different depths on opposite sides thereof for receiving said guide rails, said guide plate being adapted to be selectively inserted into said base body between said spaced parallel legs in two positions which are apart, and an upright distance plate disposed on top of said upright guide plate, said distance plate having spaced parallel slots for accommodating the contact rails.

3. A rail bearing for a warp stop motion action having electric contact rails and guide rails for the stop motion drop wires, comprising a base body having two spaced parallel legs, an upright guide plate disposed between said spaced parallel legs, and having slots adapted to receive said guide rails selectively in two positions which are 180 apart, and an upright distance plate disposed on top of said upright guide plate, said distance plate having spaced parallel slots for accommodating the contact rails. 

1. A rail bearing for a warp stop motion action having electric contact rails and guide rails for the stop motion drop wires, comprising a base body having two spaced parallel legs, one of said legs having a plurality of recesses therein, an upright guide plate provided with spaced parallel slots for the guide rails dispoSed between said spaced parallel legs, an upright distance plate disposed on top of said upright guide plate, said distance plate having spaced parallel slots for accommodating the contact rails, a cover for clamping said distance plate and said guide plate to said base body, means for connecting said cover to said base body, said means comprising a cable one end of which is connected to the other leg of said base body, and a gripping member connected to the other end of said cable and connectible to one of a plurality of the recesses in said one leg of said base body.
 2. A rail bearing for a stop motion action having electric contact rails and guide rails for the stop motion drop wires, comprising a base body having two spaced parallel legs, an upright guide plate provided with two series of parallel slots of different depths on opposite sides thereof for receiving said guide rails, said guide plate being adapted to be selectively inserted into said base body between said spaced parallel legs in two positions which are 180* apart, and an upright distance plate disposed on top of said upright guide plate, said distance plate having spaced parallel slots for accommodating the contact rails.
 3. A rail bearing for a warp stop motion action having electric contact rails and guide rails for the stop motion drop wires, comprising a base body having two spaced parallel legs, an upright guide plate disposed between said spaced parallel legs, and having slots adapted to receive said guide rails selectively in two positions which are 180* apart, and an upright distance plate disposed on top of said upright guide plate, said distance plate having spaced parallel slots for accommodating the contact rails. 